need help on box build

audiophyle_247 · Post by **audiophyle_247** » Mon Jul 28, 2008 3:44 pm

If you fire the port out the side dont forget to leave a good amount of space between the opening & any walls (ie rear door or seats, depending on direction).

Too little of space will basically choke off the port & will reduce overall output & the woofers performance.

KHPower · Post by **KHPower** » Mon Jul 28, 2008 5:07 pm

audiophyle_247 wrote:If you fire the port out the side dont forget to leave a good amount of space between the opening & any walls (ie rear door or seats, depending on direction).

Too little of space will basically choke off the port & will reduce overall output & the woofers performance.

good advice

culzero · Post by **culzero** » Tue Jul 29, 2008 3:46 pm

so can anyone help me with the port length for this option?

Option 3: (320 sq in of port) 40"W x 8"H x ?L tuned @30Hz

9 cu ft net airspace

culzero · Post by **culzero** » Thu Aug 21, 2008 10:02 am

well guys check out the starting pics

http://s513.photobucket.com/albums/t331/culzero/

culzero · Post by **culzero** » Wed Apr 22, 2009 4:27 pm

Ok guys the box has been complete for awhile now. But I got the itch again. And I am here for some more guidance. Right now I have a CRX style box and I now wanna go with a wall design. What I need from you guys is what is the smallest ported box you build for Six (6) Ti12d Elites tuned no higher than 30Hz would prefer to tune in the 25Hz range.

Here's some pics of what I got now.

GX3 · Post by **GX3** » Wed Apr 22, 2009 4:53 pm

I THINK YOUR GOING TO NEED A BIGGER AMP!!!!

Post by **joerg** » Wed Apr 22, 2009 4:54 pm

And way thicker speaker wires too!

culzero · Post by **culzero** » Thu Apr 23, 2009 8:31 am

i should have posted pics of the rest of the system. The X200.4 is only for the door speakers. I got (2) Sundown SAZ 3000d monoblocks, (3) Powermaster D3100 batteries, 300Amp Iraggi Alternator and 100ft of 1/0 power and ground

So I got the power. I just need help with the box and tuning length.

culzero · Post by **culzero** » Fri Apr 24, 2009 7:13 am

come on guys I could really use some help here.

Post by **stipud** » Fri Apr 24, 2009 8:03 am

Smallest possible box? I don't have any box building software here at work but let's see what we can come up with...

According to the manual, the SPL box is 2.25 cuft per sub, 4" vent 11" long... tuned to 31Hz. So with four subs, you need at least 2.25*4=9cuft total, and either 4 4" ports, or one bigger one.

Area of circle = pi * r^2
area of port = pi * 2^2 = 12.5663706
Total port area = 12.5663706 * 4 ports = 50.2654824

So I think that means you would need a 50 sq. in port 11" long. Now I am not sure if this is how it actually works or not... could someone with box software please run the numbers and make sure I haven't messed up?

culzero · Post by **culzero** » Fri Apr 24, 2009 8:43 am

Stipud thanks for the response. My biggest problem is the port area. I have not gotten a definitive answer from any stereo shop that is local to me nor have I really gotten a definitive answer from different forums. So I come here to ask the guru's the answer.

Does the 9cuft net total include the port displacement? Or do I need to add more cuft for port displacement? Also 50sq in of port seems a little small for 4 subs.

Thanks for all the insight.